<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>js 获取操作系统版本</title>
</head>
<body>

</body>
<script>
    function getOS() {
        const sUserAgent = navigator.userAgent;
        const isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");

        if (isWin) {
            const isWin10 = sUserAgent.indexOf("Windows NT 10") > -1 || sUserAgent.indexOf("Windows 10") > -1;
            if (isWin10) return "Win10";
            let isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;
            if (isWin7) return "Win7";
            const isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;
            if (isWinXP) return "WinXP";
            const isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;
            if (isWin2003) return "Win2003";
            const isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;
            if (isWin2K) return "Win2000";
            const isWinVista = sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;
            if (isWinVista) return "WinVista";
        }
        const isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");
        if (isMac) return "Mac";
        const isUnix = (navigator.platform == "X11") && !isWin && !isMac;
        if (isUnix) return "Unix";
        const isLinux = (String(navigator.platform).indexOf("Linux") > -1);
        if (isLinux) return "Linux";
        return "other";
    }

    window.onload = () =>{
        const os = getOS();
        document.write(os)
        alert(os)
    }
</script>
</html>
